database restore
4.According to practical experiences in the development of some database systems in order to solve the problems of link without date source name(DSN), data transmission safely,online transmission,accordance state of database,time synchronization between servers and clients,limit time database operation,data transition between different flat roofs,and finally backup and restore of floppy disk or hard disk,some simple and effective applied techniques are proposed.
6.According to the practical experience in developing some database systems, and aimed at the data transition between different flat roofs, the link without DSN, the dynamic check out, the backup and restore of floopy disk or hard disk, and the control optimization, this paper proposes some simple and effective practical techniques.

